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comparison src/os/unix/ngx_aio_read_chain.c @ 0:f0b350454894 NGINX_0_1_0

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nginx 0.1.0 *) The first public version.
author Igor Sysoev <http://sysoev.ru>
date Mon, 04 Oct 2004 00:00:00 +0400
parents
children 72eb30262aac
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-1:000000000000 0:f0b350454894
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_aio.h>
11
12
13 ssize_t ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl)
14 {
15 int n;
16 u_char *buf, *prev;
17 size_t size;
18 ssize_t total;
19 ngx_err_t err;
20
21 if (c->read->pending_eof) {
22 c->read->ready = 0;
23 return 0;
24 }
25
26 total = 0;
27
28 while (cl) {
29
30 /* we can post the single aio operation only */
31
32 if (!c->read->ready) {
33 return total ? total : NGX_AGAIN;
34 }
35
36 buf = cl->buf->last;
37 prev = cl->buf->last;
38 size = 0;
39
40 /* coalesce the neighbouring bufs */
41
42 while (cl && prev == cl->buf->last) {
43 size += cl->buf->end - cl->buf->last;
44 prev = cl->buf->end;
45 cl = cl->next;
46 }
47
48 n = ngx_aio_read(c, buf, size);
49
50 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n);
51
52 if (n == NGX_AGAIN) {
53 return total ? total : NGX_AGAIN;
54 }
55
56 if (n == NGX_ERROR) {
57 return NGX_ERROR;
58 }
59
60 if (n == 0) {
61 c->read->pending_eof = 1;
62 if (total) {
63 c->read->eof = 0;
64 c->read->ready = 1;
65 }
66 return total;
67 }
68
69 if (n > 0) {
70 total += n;
71 }
72
73 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
74 "aio_read total: %d", total);
75 }
76
77 return total ? total : NGX_AGAIN;
78 }